 ;;    - A string, represented as a sequence of characters, for example
 ;;      `"Hello world!"`;
 ;;    - A keyword, which are very similar to strings in appearance
-;;      except they are preceeded by a colon e.g. `:an-identifier`. As
+;;      except they are preceded by a colon e.g. `:an-identifier`. As
 ;;      alluded to in the example they are usually used for identifiers or
 ;;      labels and do not allow spaces.
 ;;    - A list `(...)`, this is a way of grouping values into a


;; Learning Clojure by building a digital Jackson Pollock. This
;; article and the source code backing it can be [found on
;; github](https://www.github.com/tombooth/painting-in-clojure).
;; Below is an example of what we will be building, running the code
;; found in this page.



;; For simplicity of code we are just going to consider the y axis as
;; this is the most important when it comes to working out the impact
;; force of the paint into the canvas. The above equation can
;; therefore be expressed as:

(defn impact-force [mass velocity]
